JP4932353B2 - Endoscope and repair method - Google Patents

Description

  The present invention relates to an endoscope having a bending portion in which a bending tube that is operated to bend is covered with a flexible tube, and a repair method thereof.

  A bending portion is disposed in the insertion portion of the endoscope. In this bending part, the flexible tube is coat | covered by the bending tube operated by bending. Both ends of the tube are fixed to both tubular members connected to both ends of the bending tube.

As a method of fixing the tube, there is used a method in which an end of the tube is externally fitted to a tubular member, a thread is wound around the end of the tube and tightened, and an adhesive is applied to the wound thread and hardened. . Alternatively, as disclosed in Patent Document 1, a method of directly joining an end portion of a tube to a tubular member by bonding, welding, or the like is used.
JP 2002-238837 A

  Since the tube of the bending portion is flexible, it is relatively easily damaged by the use of an endoscope or the like, and it is necessary to replace it when the tube is damaged. Here, in the fixing method in which the end portion of the tube is directly joined to the tubular member, it is difficult to cleanly remove the end portion of the tube from the tubular member. For example, the residual of the tube or the adhesive is removed from the tubular member. The operation | work which isolate | separates a tube from a tubular member becomes troublesome, for example, requires an operation | work. On the other hand, in the method of fixing the end portion of the tube with a thread and an adhesive, for example, it is necessary to wind the thread in an aligned state with a constant force so that the tightening force on the tube must be constant. The operation of fixing the member to the tubular member becomes troublesome.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an endoscope that can be easily repaired and an endoscope repair method that is easy to repair.

An endoscope according to a first embodiment of the present invention includes a bending tube that is operated to bend, a tubular member that is connected to an end of the bending tube, and a tube member that is coated on an outer peripheral surface of the bending tube. An intermediate member provided on an outer peripheral portion of the tubular member, and an end portion of the tube member is joined to an outer surface of the tubular member, and one of the tubular member and the intermediate member is arranged in the axial direction. It has the latching | locking part protrudingly provided, The other member of the said tubular member and the said intermediate member has the latching receiving part by which the said latching | locking part is latched .

An endoscope according to a second embodiment of the present invention is the endoscope according to the first embodiment, wherein the intermediate member is tubular, is covered with the tubular member, and is formed by joining a plurality of divided parts to each other. It is characterized by being.

An endoscope according to a third embodiment of the present invention is characterized in that, in the endoscope according to the first embodiment, the intermediate member has a weakened portion having low strength.

In the endoscope repair method according to the fourth embodiment of the present invention, a bending tube that is operated to bend, a tubular member connected to an end of the bending tube, and an outer peripheral surface of the bending tube are covered. A method for repairing an endoscope, comprising: a tube member; and an intermediate member provided on an outer peripheral portion of the tubular member and having an end portion of the tube member joined to an outer surface thereof, the step of destroying the intermediate member Separating the intermediate member from the tubular member, providing a new intermediate member on the outer periphery of the tubular member, and joining the end of the new tube member to the outer surface of the new intermediate member The locking portion of one of the tubular member and the intermediate member is locked in the axial direction with the locking receiving portion of the other member of the tubular member and the intermediate member. And a process .

An endoscope repair method according to a fifth embodiment of the present invention is the endoscope repair method according to the fourth embodiment, wherein the step of providing the intermediate member includes a plurality of divided parts of a tubular intermediate member. And a step of joining the plurality of divided parts to each other.

An endoscope repair method according to a sixth embodiment of the present invention is the endoscope repair method according to the fourth embodiment, wherein the step of destroying the intermediate member includes the step of destroying the weakened portion of the intermediate member. It is characterized by that.

  In the endoscope according to the first embodiment of the present invention, when exchanging the tube member, the tube member is separated from the curved tube by breaking the intermediate member and separating it from the tubular member. A new intermediate member is provided on the outer peripheral portion of the member, and the end of the new tube member is joined to the outer surface of the intermediate member, thereby fixing the tube member to the bending tube. For this reason, the tube member can be easily replaced, and the endoscope can be easily repaired.

Furthermore, in the endoscope of this embodiment , the tubular member and the intermediate member are locked by locking the locking portion and the locking receiving portion. Therefore, the intermediate member can be easily provided on the tubular member, the endoscope can be repaired more easily, and the displacement of the intermediate member with respect to the tubular member is prevented.

In the endoscope according to the second embodiment of the present invention, it is possible to provide an intermediate member on the tubular member by covering the tubular member with a plurality of divided parts and joining these divided parts together. Therefore, when the intermediate member is provided on the tubular member, it is not necessary to insert the intermediate member from the distal end portion of the endoscope to the tubular member in a state where the intermediate member is sheathed on the insertion portion of the endoscope, and the intermediate member is moved in the axial direction. For this reason, it is not necessary to disassemble a member having an outer diameter larger than the inner diameter of the intermediate member. Therefore, the endoscope can be repaired more easily. Further, the intermediate member can be formed of a material having relatively high rigidity, and the resistance of the endoscope can be increased.

In the endoscope according to the third embodiment of the present invention, by destroying the weakened portion of the intermediate member, the entire intermediate member can be easily destroyed, and the endoscope can be repaired more easily. It has become.

In the endoscope repair method according to the fourth embodiment of the present invention, the tube member is separated from the curved tube by breaking the intermediate member and separating it from the tubular member. An intermediate member is provided, and the end of the new tube member is joined to the outer surface of the intermediate member, thereby fixing the tube member to the bending tube. Thus, an easy tube member replacement method is realized, and an easy endoscope repair method is realized.

The repair method of the present actual embodiments with the endoscope, by locking the locking portion to the lock receiving portion, the intermediate member can be easily provided in the tubular member, further repair method easy endoscope Is realized.

In the endoscope repair method according to the fifth embodiment of the present invention, when the intermediate member is provided on the tubular member, it is not necessary to insert the intermediate member from the distal end portion of the endoscope to the tubular member in a state where the intermediate member is sheathed on the insertion portion. In order to move the intermediate member in the axial direction, it is not necessary to disassemble a member having an outer diameter larger than the inner diameter of the intermediate member. Therefore, an easier endoscope repair method is realized.

In the endoscope repair method according to the sixth embodiment of the present invention, it is possible to easily destroy the entire intermediate member by destroying the weakened portion of the intermediate member. Thus, an easier endoscope repair method is realized.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1A to 2.

  As shown in FIGS. 1A to 2, the endoscope of the present embodiment has an elongated insertion portion 10 that is inserted into a body cavity. The insertion portion 10 is formed by sequentially connecting a distal end hard portion 12, a curved portion 14 to be bent, and a long flexible tube portion 16 from the distal end side.

  In the bending portion 14, a bending tube 20 that is bent is formed by connecting a plurality of substantially cylindrical node rings 18 to a substantially coaxial axis so as to be rotatable with respect to each other. A distal end portion of the bending tube 20 is connected to a proximal end portion of a distal end rigid member 22 as a tubular member that forms a frame of the distal end rigid portion 12. On the other hand, the proximal end portion of the bending tube 20 is fitted and fixed to the distal end side of a connection ring 24 as a tubular member disposed at the distal end portion of the flexible tube portion 16. The bending tube 20 is covered with a flexible tube 26 as a tube member. The proximal end portions of the tubes 26 are fixed at the distal end rigid member 22 and the connection ring 24, respectively.

  Hereinafter, a method for fixing the tube 26 will be described in detail.

  As for the proximal end portion of the tube 26, an engaging groove portion 28 is extended over the entire circumference as an engaging receiving portion on the outer peripheral portion of the connection ring 24 at the proximal end portion of the bending portion 14. The distal end side surface of the locking groove portion 28 has a tapered shape that is inclined from the outside toward the inside from the proximal end side toward the distal end side. A substantially cylindrical intermediate member 30 made of an elastic material such as an elastomer is fitted and locked in the locking groove 28. In the present embodiment, the entire intermediate member 30 functions as a locking portion that is locked to the locking groove 28, and the intermediate member 30 is positioned with respect to the connection ring 24. The distal end surface of the intermediate member 30 has a tapered shape corresponding to the distal end side surface of the locking groove portion 28 and is pushed into the distal end side surface of the locking groove portion 28 to keep watertight. In this way, the space between the intermediate member 30 and the connection ring 24 is kept watertight. And the base end part of the tube 26 is fitted on the outer peripheral surface of the intermediate member 30, and it joins by adhesion | attachment or welding.

  As the material of the intermediate member 30, the same material as the material of the tube 26 is selected so as to be suitable for adhesion or welding with the tube 26. For example, when the tube 26 is formed of urethane, styrene, polyester, polyamide, or silicone elastomer, the intermediate member 30 is urethane, styrene, polyester, polyamide, or silicone, respectively. System materials are used.

  The distal end portion of the tube 26 is also fixed in the same manner, that is, the intermediate member 30 is fitted and locked in the locking groove portion 28 of the distal end hard member 22, and the tube 26 is attached to the outer peripheral surface of the intermediate member 30. The tip part is fitted and joined. Note that the base end side surface of the locking groove 28 and the base end surface of the intermediate member 30 are tapered.

Next, an endoscope repair method according to this embodiment will be described.
The tube 26 of the bending portion 14 may be damaged by repeated use of the endoscope, cleaning, disinfection, sterilization, and the like. In this case, the tube 26 needs to be replaced. When exchanging the tube 26, the damaged tube 26 is separated from the bending tube 20 by breaking the intermediate member 30 at the proximal end and separating it from the distal end hard portion 12 and the connection ring 24. The tube 26 and the adhesive remain on the distal end rigid portion 12 and the connection ring 24 from which the intermediate member 30 has been separated, and the locking groove portion 28 remains almost new. Subsequently, a new intermediate member 30 is prepared, and the intermediate member 30 is inserted from the distal end portion of the endoscope to the connection ring 24 in a state where it is sheathed on the insertion portion 10. Here, since the outer diameters of the distal end rigid member 22 and the connection ring 24 are larger than the outer diameter of the intermediate member 30 except for the locking groove 28, the intermediate member 30 is elastically deformed to increase its inner diameter, The hard member 22 and the connection ring 24 are passed. Then, the intermediate member 30 is pushed into the locking groove portion 28 of the connection ring 24 to be fitted and locked to the connection ring 24. Similarly, another new intermediate member 30 is fitted and locked to the distal end hard member 22. Thereafter, the tube 26 is covered with the bending tube 20, and both ends of the tube 26 are externally fitted to the outer peripheral surface of the intermediate member 30 at the proximal end, and are joined by adhesion or welding. In this way, the replacement of the tube 26 is completed.

  Therefore, the endoscope of this embodiment has the following effects.

  In the endoscope of the present embodiment, when the tube 26 is replaced, the tube 26 is separated from the bending tube 20 by breaking the intermediate member 30 and separating it from the distal end hard member 22 or the connection ring 24. In addition, a new intermediate member 30 is fitted and locked to the distal end hard member 22 or the connection ring 24, and both ends of the new tube 26 are joined to the outer peripheral surface of the intermediate member 30. The tube 26 is fixed. For this reason, it is possible to easily replace the tube 26 and to easily repair the endoscope.

  Further, the distal end rigid member 22 or the connection ring 24 and the intermediate member 30 are locked by locking the intermediate member 30 in the locking groove. For this reason, the intermediate member 30 can be easily provided on the distal end rigid member 22 or the connection ring 24, and the endoscope can be repaired more easily, and the distal end rigid member 22 or the connection ring 24 can be repaired. The intermediate member 30 is prevented from being displaced with respect to.

  Further, when the intermediate member 30 is fitted and locked to the distal end rigid member 22 and the connection ring 24, the intermediate member 30 is externally mounted on the insertion portion 10 from the distal end portion of the endoscope to the distal end rigid member 22 or the connection ring 24. It is necessary to insert with. Here, by elastically deforming the intermediate member 30, the intermediate member 30 can be moved in the axial direction with respect to the distal end hard member 22 and the connection ring 24 having an outer diameter larger than the inner diameter of the intermediate member 30. Therefore, when the intermediate member 30 is fitted and locked to the distal end rigid member 22 or the connection ring 24, it is not necessary to disassemble the distal end rigid member 22 or the connection ring 24 from the distal end portion of the bending portion 14, and repair of the endoscope. Can be performed more easily. In addition, the configuration of the endoscope can be simplified by using the elasticity of the intermediate member 30 to add a watertight holding function to the intermediate member 30.

  3 and 4 show a second embodiment of the present invention. Components having the same functions as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  3 and 4, at the proximal end portion of the bending portion 14, the distal end side surface of the locking groove portion 28 and the distal end surface of the intermediate member 30 are not tapered. Between the front end side surface of the locking groove 28 and the front end surface of the intermediate member 30, an O-ring 32 for maintaining watertightness is interposed. Similarly, at the distal end portion of the curved portion 14, a watertight O-ring 32 is interposed between the proximal end side surface of the locking groove portion 28 that is not tapered and the proximal end surface of the intermediate member 30. .

  The intermediate member 30 of the present embodiment is formed of a highly rigid material such as resin. Further, the intermediate member 30 is formed by joining two divided parts 30a and 30b divided by a plane including the central axis thereof.

Next, an endoscope repair method according to this embodiment will be described.
When replacing the tube 26, the damaged tube 26 is removed as in the first embodiment. Subsequently, two new divided parts 30a and 30b for forming the intermediate member 30 are prepared. Then, one divided component 30a is fitted and locked to one side of the locking groove 28 of the connection ring 24, and the other divided component 30b is fitted and locked to the other side of the locking groove 28 of the connection ring 24. Then, both end surfaces of the two divided parts 30a and 30b are brought into contact with each other and bonded together by adhesion or welding. In this way, the intermediate member 30 in a state of being fitted and locked in the locking groove portion 28 of the connection ring 24 is formed. Similarly, the intermediate member 30 is also formed in the locking groove 28 of the distal end hard member 22. Hereinafter, similarly to the first embodiment, the tube 26 is covered with the bending tube 20, and both ends of the tube 26 are joined to the outer peripheral surface of the intermediate member 30 at the proximal end.

Therefore, the endoscope of this embodiment has the following effects.
In the endoscope of the present embodiment, a plurality of divided parts 30a and 30b are fitted and locked to the distal end hard member 22 and the connection ring 24, and these divided parts 30a and 30b are joined to each other, whereby the distal end hard member 22 and An intermediate member 30 is formed on the connection ring 24. For this reason, in order to fit and lock the intermediate member 30 to the distal end rigid member 22 or the connection ring 24, the intermediate member 30 is sheathed on the insertion portion 10 from the distal end portion of the endoscope to the distal end rigid member 22 or the connection ring 24. It is not necessary to insert in the state, and it is not necessary to disassemble the distal end rigid member 22 and the connection ring 24 having an outer diameter larger than the inner diameter of the intermediate member 30 in order to move the intermediate member 30 in the axial direction. Therefore, the endoscope can be repaired more easily. Further, the intermediate member 30 can be formed of a material having a relatively high rigidity, and the resistance of the endoscope can be increased.

  4 and 5 show a third embodiment of the present invention. Configurations having functions similar to those of the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  With reference to FIG.4 and FIG.5, the convex part 34 as a latching | locking part is protrudingly provided by the inner peripheral surface of the intermediate member 30 of this embodiment in the radial direction. On the other hand, referring also to FIG. 1A, a concave portion 36 is formed in the outer peripheral surface portion of the distal end hard member 22 and the connection ring 24 as a locking receiving portion into which the convex portion 34 is fitted and locked. The convex portion 34 of the intermediate member 30 is fitted and locked in the concave portion 36 of the distal end hard member 22 or the connection ring 24, so that the intermediate member 30 is axially and circumferentially connected to the distal end hard member 22 or the connection ring 24. Is positioned.

  Here, the intermediate member 30 is replaced relatively frequently together with the tube 26, and is preferably inexpensive. As in the present embodiment, the intermediate member 30 having the projecting portions 34 projecting in the radial direction has a shape suitable for molding using a mold, and in the case where a large number of the same intermediate members 30 are formed. The intermediate member 30 can be manufactured at a low cost.

  7A to 8 show a fourth embodiment of the present invention. Configurations having functions similar to those of the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  With reference to FIGS. 7A to 8, in the present embodiment, at the base end portion of the bending portion 14, a convex portion 34 is projected in the axial direction on the distal end surface of the intermediate member 30, and the locking groove portion of the connection ring 24. A concave portion 36 into which the convex portion 34 is fitted and locked is formed in the tip side surface of 28 in the axial direction. Similarly, in the distal end portion of the curved portion 14, referring also to FIG. 1A, a convex portion 34 protrudes in the axial direction on the proximal end surface of the intermediate member 30, and the proximal end side surface of the locking groove portion 28 of the distal end hard member 22 A recess 36 is drilled in the axial direction. Similarly to the third embodiment, the convex portion 34 of the intermediate member 30 is fitted and locked in the concave portion 36 of the distal end hard member 22 or the connection ring 24, so that the intermediate member is not moved relative to the distal end hard member 22 or the connection ring 24. 30 is positioned in the axial direction and the circumferential direction.

  Like this embodiment, the intermediate member 30 which has the convex part 34 which protrudes in an axial direction can be manufactured cheaply by cutting. Moreover, since the convex part 34 and the recessed part 36 are formed in the axial direction, compared with the case where it forms in radial direction, the member in which the recessed part 36 is formed can be thinned, and the endoscope The insertion portion 10 can be reduced in diameter.

  FIG. 9 shows a fifth embodiment of the present invention. Configurations having functions similar to those of the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, a groove is extended on the inner peripheral surface portion of the intermediate member 30 over the entire length in the axial direction, and a weakened portion 40 having a low strength is formed. When replacing the tube 26, when the intermediate member 30 is destroyed, the weak part 40 is destroyed, so that the entire intermediate member 30 is destroyed. For this reason, the whole intermediate member 30 can be easily destroyed, and the endoscope can be repaired more easily.

  In the present embodiment, the fragile portion 40 is formed by the groove portion, but the fragile portion 40 can also be formed by a notch, a cut, or the like.

The longitudinal cross-sectional view which shows the endoscope of 1st Embodiment of this invention. The cross-sectional view which cuts and shows the endoscope of 1st Embodiment of this invention along the IB-IB line | wire of FIG. The perspective view which shows the intermediate member of the endoscope of 1st Embodiment of this invention. The longitudinal cross-sectional view which shows the endoscope of 2nd Embodiment of this invention. The perspective view which shows the intermediate member of the endoscope of 2nd Embodiment of this invention. The cross-sectional view which shows the endoscope of 3rd Embodiment of this invention. The perspective view which shows the intermediate member of the endoscope of 3rd Embodiment of this invention. The longitudinal cross-sectional view which shows the endoscope of 4th Embodiment of this invention. The cross-sectional view which cuts and shows the endoscope of 4th Embodiment of this invention along the VIIB-VIIB line | wire of FIG. 7A. The perspective view which shows the intermediate member of the endoscope of 4th Embodiment of this invention. The perspective view which shows the intermediate member of the endoscope of 5th Embodiment of this invention.

Explanation of symbols

  20 ... curved tube, 22; 24 ... tubular member, 26 ... tube member, 30 ... intermediate member.

Claims (6)

A bending tube operated by bending;
A tubular member connected to an end of the bending tube;
A tube member coated on the outer peripheral surface of the bending tube;
An intermediate member provided on the outer peripheral portion of the tubular member, and an end portion of the tube member is joined to the outer surface thereof;
Equipped with,
One of the tubular member and the intermediate member has a locking portion protruding in the axial direction,
The other member of the tubular member and the intermediate member has a locking receiving portion to which the locking portion is locked,
An endoscope characterized by that. The intermediate member is a tubular endoscope according to claim 1, characterized in that it is formed by joining Rutotomoni being fitted on said tubular member, a plurality of divided parts to each other. The intermediate member has a weakened weak portion,
The endoscope according to claim 1. A bending tube operated to bend, a tubular member connected to an end of the bending tube, a tube member coated on the outer peripheral surface of the bending tube, and an outer surface provided on the outer peripheral portion of the tubular member An intermediate member having an end portion of the tube member joined to the endoscope,
Destroying the intermediate member;
Separating the intermediate member from the tubular member;
Providing a new intermediate member on the outer periphery of the tubular member;
Joining the end of the new tube member to the outer surface of the new intermediate member;
Equipped with,
Locking the locking portion of one member of the tubular member and the intermediate member axially to the locking receiving portion of the other member of the tubular member and the intermediate member,
An endoscope repair method characterized by the above. The step of providing the intermediate member further includes a step of covering a plurality of divided parts of the tubular intermediate member on the tubular member and joining the plurality of divided parts to each other.
The endoscope repair method according to claim 4 . The step of destroying the intermediate member includes the step of destroying the fragile portion of the intermediate member,
The endoscope repair method according to claim 4 .

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