JPS63249542A - Guide tube for endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscope guide tube through which an insertion section of an endoscope is inserted and guided into a body cavity or the like.

[Prior Art] Generally, this type of guide tube for an endoscope is formed from a single flexible cylinder and has a fixed length. Therefore, when using this guide tube, it is first fitted into the insertion section of the endoscope to be used, and then the insertion section is inserted into the body cavity.

[Problems to be Solved by the Invention] However, the guide tube for an endoscope has a relatively long fixed length and is non-stretchable. When attached to an endoscope, the length of the insertion section that can be effectively used is reduced by the entire length of the guide tube.

Furthermore, the proximal portion of the insertion portion becomes hard over a considerable length, making handling extremely inconvenient.

Furthermore, if the length of the guide tube is shortened in an attempt to make it easier to handle, there arises the problem that, for example, the guide tube cannot be straightened sufficiently deep into the intestine.

On the other hand, as seen in Japanese Utility Model Publication No. 56-43286, a cutout is made along the longitudinal axis of the endoscope, and the cutout is expanded to fit into the insertion section of the endoscope from the side. There is a risk that mucous membranes in the body cavity may be caught between the cut points. Furthermore, it is time-consuming and troublesome to attach this type of guide tube to the insertion section.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to increase the length at which the insertion section can be straightened by attaching the guide tube of the endoscope, while also making it possible to increase the length of the insertion section on the proximal side of the insertion section. To enable easy handling and safe use of an endoscope when attached to the endoscope.

[Means and effects for solving the problems] In order to solve the above problems, the present invention provides an endoscope guide tube having a hollow passage into which an endoscope insertion section can be inserted, which includes at least two outer tubes. The inner diameter of the proximal cannula is larger than the outer diameter of the adjacent distal cannula, and the adjacent distal cannula is inserted into the proximal cannula so that it can be freely stored. In addition, a locking mechanism is provided for locking the distal end-side mantle tube to each other when the distal end-side mantle tube is pulled out from the proximal end-side mantle tube and extended.

When using this guide tube, each mantle tube is lengthened. Furthermore, each of the mantle tubes can be shrunk and fitted onto the proximal portion of the endoscope insertion section.

[Embodiment] FIGS. 1 to 4 show a first embodiment of the present invention. This guide tube 1 for an endoscope consists of a first outer tube 2 and a second outer tube 3, as shown in FIG. The first mantle tube 2 has a flexible helical tube 4 made of, for example, a band-shaped metal plate as a core material, and a mesh tube 5 made of metal or resin is fitted around the outer periphery of the helical tube 4. It is. Further, the outer periphery of the mesh pipe 5 is covered with an outer tube 6 made of resin. Further, the inner periphery of the spiral tube 4 is covered with an inner tube 7 also made of resin. The first mantle tube 2 has flexibility and can be freely curved.

Furthermore, the respective distal ends of the outer tube 6 and the inner tube 7 extend beyond the distal ends of the spiral tube 4 and the mesh tube 5 and are directly in close contact with each other.

Further, a cylindrical fixing body 8 is fixedly attached to the base end of the first mantle tube 2 by means of adhesive or the like. A male thread 9 is formed on the outer periphery of the distal end of the fixed body 8, and
A flange 10 is formed at the proximal end portion. The external thread 9 and the flange 10 are formed to have an outer diameter larger than the outer diameter of the front of the first outer tube and slightly smaller than the inner diameter of the second outer tube 3. The first mantle tube and the fixed body 8 can be housed inside the second mantle tube 3. In addition, in the fixed body 8, a locking groove 11 is formed in an annular shape on the outer periphery between the male thread 9 and the flange 10. Further, an arcuate groove 12 is formed inside the base end of the fixed body 8 to fit the edges of the spiral tube 4 and the mesh tube 5 so as to prevent them from coming off.

On the other hand, like the first mantle tube 2, the second mantle tube 3 is composed of a spiral tube 15 as a core material, a mesh tube 16 into which it is fitted, an outer tube 17, and an inner tube 18, and itself is Although it is flexible, it has enough elastic hardness to restrain body cavities such as the sigmoid colon from deforming during colon examinations. A substantially cylindrical tip member 19 is fixedly attached to the distal end of the second mantle tube 3 by the same structure as that of the fixed body 8 in the first mantle tube 2 described above.

A female thread 20 is formed on the inner circumferential surface of the tip member 19 to be screwed into the male thread 9 of the fixed body 8. That is, the male thread 9 and the female thread 20 constitute a locking mechanism for locking the bipolar cannula 2 and 3. Further, the inner periphery of the distal end member 19 is provided with a collar portion 2 against which the distal end wall of the fixed body 10 to be screwed comes into contact.
1 is formed. In other words, the fixed body 8 is attached to the tip member 19.
When screwing in, it is restricted by the flange 21 and the extreme end position is determined. Note that the positioning when screwed in may be regulated by providing a collar portion on the fixed body 10. Further, the outer periphery of the distal end of the distal end member 19 is formed as a tapered circumferential surface 22 so that it can easily enter the patient's body cavity.

Furthermore, the tip of the tip member 19 is also formed smoothly so that there are no corners.

On the other hand, a cylindrical main body 25 is fixed to the proximal end of the second mantle tube 3 in the same structure as the fixed body 8 of the first mantle tube 2 . A screw 26 is formed on the outer periphery of the base end portion of this main body 25, and a cover integral 27 is formed on this screw 26.
are configured to be screwed together. Further, a restraining ring 29 is attached to the proximal edge 28 of the cover unit 27. This restraining ring 29 is made of an elastic material such as rubber, and the inner circumferential edge 30 passes over the flange 10 on the fixed body 8 of the first mantle tube 2 to fit into the locking groove 1 of the fixed body 8.
1 and can be attached.

Next, a method of using the guide tube 1 having the above structure will be explained. First, the guide tube 1 is attached to the insertion section 40 of the endoscope before the insertion section 40 is inserted into the patient's body cavity. At this time, the second
As shown in the figure, the first mantle tube 2 is housed within the second mantle tube 3 to keep the overall length short. That is, since the outer diameter of the first mantle tube 2 is smaller than the inner diameter of the second mantle tube 3,
It can be slid and stored within the second mantle tube 3. Further, the flange 10 of the fixed body 8 is pushed in until it expands and exceeds the inner peripheral edge 30 of the restraining ring 29, and the inner peripheral edge 3
0 into the locking groove 11 and lock it. Thus, the bipolar canals 2 and 3 are temporarily fixed.

Next, the operator moves the shortened guide tube 1 toward the proximal side of the insertion section 40, and inserts the insertion section 40 into the body cavity as shown in FIG. Generally, after the tip of the insertion portion 40 reaches the left colon, the figure-eight colon is extended, and the guide tube 1 is extended as shown in FIG. That is, the first mantle tube 2 is pulled out from the second mantle tube 3, and the tip member 1 in the second mantle tube 3 is inserted into the second mantle tube 3 with respect to the fixed body 8 in the first mantle tube 2.
Screw together the female screws 20 of No. 9 and fix. Then, as shown in FIG. 4, it is pushed into the body cavity along the insertion section 40. As a result, the insertion section 40 of the endoscope can be made straight and can be inserted deeper. In addition, the mantle tube 2.3 has no cutout or the like and does not pinch mucous membranes, so it is safe.

According to the above configuration, the length of the guide tube 1 attached to the insertion section 40 can be kept short when the guide tube 1 is not in use.

Therefore, the effective length of the insertion section 1 of the endoscope is increased, and the insertion section 40 can be used effectively. For this reason, for example, if the large intestine has an abnormal course and requires a long effective length to reach the left colonic flexure, it can be examined very effectively and efficiently.

Furthermore, the first mantle tube 2 can be removed from the proximal end of the second mantle tube 3 and can be completely separated, which is convenient for cleaning and disinfecting them.

FIG. 5 shows a second embodiment of the invention. This embodiment is different from the first embodiment described above in the mechanism for locking the first mantle tube 2 and the second mantle tube 3. That is, the outer periphery of the proximal end of the fixed body 8 is a first tapered surface 51 with a larger diameter on the proximal side, and the inner periphery of the proximal end of the tip member 19 is a second tapered surface 52 that matches the tapered surface 50. The two tapered surfaces 51 and 52 are fitted and locked together. Furthermore, a mounting groove 54 into which an elastic backing 53 is fitted is formed on the inner surface of the tip member 19. The elastic backing 53 is fitted into a locking groove 54 formed in an annular shape on the outer periphery of the fixed body 8. In other words, the elastic backing 53 has both the above-mentioned tapered surfaces 51 and 52.
When engaged, it fits into the locking groove 544 and produces a click feeling.

FIG. 6 shows a third embodiment of the invention. The locking mechanism in this embodiment uses two backings 55,56. Each of the backings 55 and 56 is mounted in mounting grooves 57 and 58 formed on the inner surface of the tip member 19.

In addition, locking grooves 59 and 60 are formed on the outer periphery of the fixed body 8 to fit and lock the backings 55 and 56.

7 and 8 show a fourth embodiment of the present invention. In this embodiment, a leaf spring 61 is attached to the fixed body 8 side, and a locking groove 6 for securing the leaf spring 61 to the tip member 19 side.
2 to form a locking mechanism. Note that the leaf spring 61 is attached and fixed by a set screw 63,
Further, as shown in FIG. 8, four locations are provided on the circumference of the fixed body 8.

FIG. 9 shows a fifth embodiment of the present invention. In this embodiment, the first mantle tube 2 and the second mantle tube 3 are integrally molded from resin such as polyurethane. Also, tapered surfaces 65 and 66 that engage the outer periphery of the proximal end of the first mantle tube 2 and the inner periphery of the distal end of the second mantle tube 3, respectively.
The locking mechanism was constructed as follows.

FIG. 10 shows a sixth embodiment of the present invention. The locking mechanism in this embodiment is provided with a ball 71 urged to protrude by a spring 70 on the fixed body 8 side, and correspondingly, the ball 71 is dropped into the inner peripheral surface of the tip member 19. It is provided with a locking groove 72 for locking.

FIG. 11 shows a seventh embodiment of the present invention. The locking mechanism of this embodiment is formed by forming hook portions 75, 76 that engage with each other at the proximal end of the first mantle tube 2 and the distal end of the second mantle tube 3, and furthermore, the hook portions 75, 76 that engage with each other. are formed with mutually engaging tapered surfaces 77,78.

FIG. 12 shows an eighth embodiment of the present invention. The locking mechanism of this embodiment has a locking hole 80 formed on the fixed body 8 side, a locking hole 81 corresponding to the tip member 19, and a locking hole 80 that is fitted over both of the locking holes 80 and 81. It is provided with six removable pins 82 to be inserted.

FIG. 13 shows a ninth embodiment of the present invention. In the locking mechanism of this embodiment, a locking hole 85 is formed on the fixed body 8 side, and a retaining lever 87 connected with a pin 86 is provided on the distal end member 19 side. 88 is fitted into the locking hole 85 to lock it.

FIG. 14 shows a tenth embodiment of the present invention.

The locking mechanism of this embodiment includes a balloon 90 provided around the entire circumference of the fixed body 8, and this balloon 90 is connected to an air pipe 93 through a recess 91 and a passage 92 formed in the fixed body 8. be. Compressed air is sent to the balloon 90 through these air passages to inflate it so that it is pressed against the inner surface of the tip member 19 and locked. Note that a check valve (not shown) is provided on the base end side of the air passage to prevent air once supplied from leaking unless a release operation is performed.

FIG. 15 shows an eleventh embodiment of the present invention.

This embodiment uses three mantle tubes 95, 96°97. If the lengths of the guide tubes 1 when extended are the same, the length when shortened can be made shorter, and the effective length of the insertion section of the endoscope can be increased. The locking mechanism in this eleventh embodiment is the same as that in the fifth embodiment.

However, the formats shown in the other embodiments described above may also be used.

[Effects of the Invention] As explained above, according to the present invention, it is possible to increase the length for straightening the insertion section of the endoscope by attaching the guide tube, and it is also possible to straighten the insertion section of the endoscope by attaching the guide tube to the proximal portion of the insertion section. Since the length can be shortened, a sufficient effective length of the insertion portion of the endoscope can be secured, and the guide tube for the endoscope is easy to handle and can be used safely.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the first embodiment, FIG. 2 is a side sectional view of the first embodiment, and FIGS. 3 and 4 are schematic views of the first embodiment. 5 is a sectional view of the locking mechanism portion of the second embodiment, FIG. 6 is a sectional view of the locking mechanism portion of the third embodiment, and FIG. 7 is a sectional view of the locking mechanism portion of the third embodiment. FIG. 8 is a sectional view taken along line A in FIG. 7, FIG. 9 is a sectional view of the locking mechanism portion of the fifth embodiment, and FIG. is a sectional view of the locking mechanism portion of the sixth embodiment, FIG. 11 is a sectional view of the locking mechanism portion of the seventh embodiment, and FIG. 12 is a sectional view of the locking mechanism portion of the eighth embodiment. , FIG. 13 is a sectional view of the locking mechanism portion of the ninth embodiment, and FIG. 14 is a sectional view of the locking mechanism portion of the tenth embodiment.
FIG. 15 is a side sectional view of the eleventh embodiment. DESCRIPTION OF SYMBOLS 1... Guide tube, 2, 3... Mantle tube, 8... Fixed body, 9... Male thread, 19... Tip member, 50.51.
...Tapered surface, 55.56...Backing, 61...
・Plate spring, 62...Latching groove, 70...Spring, 71・
... Sphere, 75°76 ... Key part, 80.81 ...
Hole, 82... Pin, 85... Hole, 87... Retention lever, 90... Balloon, 95.96.97...
Mantle tube. Applicant's representative Patent attorney Jun Tsuboi Figure 3 Figure 4 Figure 5 Figure 6 A Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 13 Figure 15

Claims (1)

[Claims] An endoscope guide tube having a hollow passage through which an endoscope insertion portion can be inserted is composed of at least two mantle tubes, and the outer diameter of the mantle tube on the proximal end side is larger than the outer diameter of the mantle tube on the adjacent distal side. The inner diameter is increased so that the adjacent distal mantle tube can be inserted into the proximal mantle tube for storage, and a lock that locks the mantle tubes together when they are pulled out from the distal mantle tube and stretched. An endoscope guide tube characterized by being provided with a stop mechanism.